According to the passage, scientists have discovered that influenza viruses ______ . What is known about the influenza virus?

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问题 According to the passage, scientists have discovered that influenza viruses ______ .
What is known about the influenza virus?

选项 A、It was first found in a group of very old birds.
B、All the different strains can be found in wild birds.
C、It existed over 100 million years ago.
D、It can survive in many different places.

答案D

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